Elevator door mechanism



Ma'rch 1934- v c. NORTON ET AL 50- ELEVATOR DOOR MECHANISM Filed Oct 11, 1933 5 Sheets-Sheet 1 Q w L I ATTORNEY- March 6, 1934. c NORTON ET AL 1,950,150

' ELEVATOR noon MECHANISM Filed Oct. 11, 1935 5 Sheets-Sheet 2 (16W N J21 INVENTORS ATTORNEY March 6, 1934. c. NORTON ET AL 1,950,150

ELEVATOR 1500a MECHANISM Filed Oct.' 11, 1933 5 Sheets-Sheet 3 E .5 j a 3 L g Y h a g Q FIG.

F16. IO

ELM NJ;

INVENTORS WW ATTORNEY March 6, 1934. c. NORTON ET AL ELEVATOR DOOR MEC ANISM Filed 001;. 11, 1933 5 Sheets-Sheet 4 }l NVENTORS ATTOR N EY March 6,1934. c, NORTON Em 1,950,150

ELEVATOR DOOR MECHANISM Filed Oct. 11, 1953 5 Sheets-Sheet 5 6b 82\ gr; 'BI m5 )3 'l0451 @8 1 65 H m m m (,6 0 mm 5 b7 1311 Nam I Fl 0. l3 WWQ BY ATTORNEY.

Patented Mar. 6, 1934 PATENT @FFICE ariava'roa noon MECHANISM Clifiord Norton and Benjamin Whitehead Tucker, .l'r., South Orange, N. J., assignors to Otis Elevator Company, New York, N. Y., a corporation of New Jersey Application October 11, 1933, Serial No. 693,066

22 Claims.

This invention relates to door operating equipment for doors associated with elevator installations.

The principal object of this invention is to provide simple, effective, quiet and safe door operating and related equipment for the various doors in an elevator installation.

A feature of the invention resides in the provision of mechanisms individual to each elevator hatchway door for actuating such doors at the various landings, individually, by means of a motive unit carried by the elevator car, the mechanisms being so arranged that while the elevator car travels up and'down in the hatchway, ample running clearances are provided between the mechanisms on the elevator car and the mecha-- nisms individual to the various hatchway doors.

Another feature of the invention resides in providing that such mechanisms look their corresponding hatchway door in closed position at all times except when such hatchway door is being actuated by the motive unit on the elevator car, the arrangements being such that the mechanisms individual be a hatchway door are actuated to unlock the hatchway door prior to opening the same.

A third feature of the invention is the provision that, during the closing, and preferably also the opening, of each hatchway door, the running clearances provided between the car mechanisms and the door mechanisms while the car is in motion, are reduced, or eliminated entirely, so that there is little or no play between the hatchway door being actuated and the motive mechanisms on the car actuating it.

A fourth feature of the invention is the provision of additional mechanisms, for such floors at which they are desired, for enabling one to unlock and open the hatchway doors at such floors from the landing or corridor side thereof, the arrangements being such that a device, such as a service key, may actuate such additional mechanisms only-in the event the elevator car is opposite the landing for such hatchway door.

A fifth feature of the invention is the provision of other additional mechanisms by which a hatchway door may be unlocked and opened from the landing or corridor side thereof at any time, even if the elevator car is not opposite such landadditional mechanisms for a hatchway door are actuated by a device, such as an emergency or firemans key, which normally is accessible only by breaking the glass cover of a protective box in which it is kept.

ing, the arrangements being such that these other A sixth feature of the invention resides in providing that the mechanisms for actuation by the emergency or firemans key to effect unlocking and opening of the hatchway doors from the landing or corridor side thereof cannot be actuated 50 by the service key, so that the building attendants in possession of a service key can unlock and open a hatchway door from the landing or corridor side thereof only if the elevator car is oppo site the landing for such hatchway door.

Other features will become apparent from the specification taken in consideration with the accompanying drawings and subjoined claims.

The invention involves motive equipment of suitable character mounted on the elevator car W arranged to actuate the hatchway door or doors I at landings opposite which the elevator car stops. The motive equipment causes the movement of a cam or an equivalent device mounted on the elevator car and, by means of cooperating mecha- W nisms provided on or adjacent the hatchway door, such movement of the cam is transmitted to such hatchway door to cause its opening and closing. The mechanisms individual to the hatchway door are arranged to provide ample running cleardd ances for the cam on the car as the car travels past the floor at which such hatchway door is provided without stopping. These mechanisms are also arranged so that, in the initial stages of door opening operation, such running clearances are reduced or eliminated, with the result that during the actuation of the hatchway door by the motive equipment on the car, there is little or no play in the drive for the hatchway door. These mechanisms are also preferably arranged 00 so that they control the hatchway door locks, and

in fact may be arranged, as in the illustrated constructions, with the door locking mechanisms combined therewith. This invention also provides that the hatchway doors may be unlocked 96 and opened manually, from the landing or corridor sides of the doors, under suitable safety precautions.

In carrying out the invention according to the preferred embodiment thereof illustrated, the car 100 door is provided with a cam fixed thereto. The hatchway door is provided with two bell cranks, each having a downwardly extending arm and a horizontally extending arm, pivotally mounted upon spaced pivots secured to the hatchway door. 10] Each downwardly extending arm of the bell cranks is provided with a roller for engaging the cam, the arrangement being such that the cam is interposed between the rollers on the two downwardly extending arms when the elevator 11 iii? car is opposite the floor. The horizontally extending arm of one bell crank is formed with a hook to engage a keeper secured to the hatchway for locking the hatchway door in closed position, a suitable spring being provided to coomrate with the horizontally extending arm so as to main= tain it in the position in which the hook thereon cooperates with the keeper to effect such locking action. In this position of the bell crank having the hook thereon, the roller on such bell crank is spaced from the cam a suitable distance to enable the elevator car, with the car door in closed position, to travel past the floor without interference between the cam on the car and the roller on such bell crank. The horizontally extending arm of the other bell crank is connected to the. corresponding arm of the bell crank having the hook thereon in such a manner that the distance between the point of connection and the pivot points of the respective bell cranks is greater for the bell crank having the hook thereon than for the other bell crank. The connection is of a pin-and-slot character that enables each bell crank to rotate about its pivot.within itsgiven range of rotation-while at the same time preventing play between the two bell cranks. The arrangement is such that while the bell crank having the hook thereon is maintained in the position in which it locks the hatchway door closed, the other bell crank is maintained in a position in which the roller on the downwardly extending arm thereof is spaced a suitable distance from the cam so that there is no interference between such roller and the cam as the elevator car travels past the floor with the car door in closed position. There is thus provided ample running clearance at both sides of the cam. As a result of the construction, arrangement, and interconnection of the two bell cranks previously described, the first motion of the car door from its closed position when the elevatorcar is opposite the floor, takes up the clearance between the car door cam and the roller on the bell crank having the hook thereon. Further motion of the car door in the opening direction causes the bell crank having the hook thereon to rotate to effect unlocking of the hatchway door and also causes the. rotation of the other bell crank to reduce the distance between the cam and the roller on such other bell crank. Still further motion of the car door in the opening direction causes the bell cranks to rotate until the roller on the other bell crank has been moved to substantially eliminate all of the distance between it and the cam. The cam is then substantially engaged on both sides by the two rollers. A latch is provided which is effective at this time to maintain the bell cranks in this position so that the car door and the hatchway door operate as a unit, without relative motion therebetween, during the remaining, and principal, portion of door opening operation, and during the entire door closing operation until the hatchway door attains closed position. At such time a releasing mechanism for the latch is efiective to release the bell cranks and permit their rotation to their initial positions as the car door, and car door cam, return totheir initial, door closed positions.

To afford access to the elevator installation from the landing side of the hatchway door, there is provided a member, movably mounted thereon, arranged to be moved. into engagement with the car door cam and thereby cause the movement of such cam in the opening direction in simulation of a normal door opening operation.-

Such a. member thus unlocks the hatchway door and moves it from closed position only when the elevator car is opposite the floor. v A second member is providedon the hatchway door and is arranged to he moved directly into engagement with one of the bell cranks to cause the rotation thereof and thus the unlocking of the hatchway door. It is clear that this second member unlocks the hatchway door regardless of the position of theelevator car. To prevent actuation of the second member, except in emergencies, it is provided that the first and second members are actuated from the landing side of the hatchway door by non-interchangeable keys, the key for the second member being housed in a break-glass receptacle, and only keys for the first member being distributed to the elevator attendants and service men.

In the drawings:--

Figure 1 is a front elevation of an elevator car of an installation in which this invention'has been incorporated;

- Figure 2 is a plan view of-the car shown in Figure 1, together with a plan view of the cooperating mechanism for a hatchway door;

Figure 3 is a section taken along the line 33 of Figure 2, showing certain details of the mechanical brake;

Figure 4 is a view in elevation of a hatchway door and related mechanisms, as seen from with- 105 in the hatchway;

Figure 5 is an enlarged'view of a portion of Figure 4, with certain parts broken away;

Figure 6 is a still more enlarged view of one of the mechanisms shown in Figure 5;

Figure 7 is an end view of the mechanism shown in Figure 6;

Figure 8 is a sectional view taken along the line 3-8 of Figure 5;

Figure 9 is a sectional view taken along the line 9-9 of Figure 5;

Figures 10, 11 and 12 are figures showing-the relative positions or" the parts of the mechanism of Figure 5 in various stages in the operation oi the hatchway door;

Figure 13 is a view similar to Figure 5, showing also certain additional mechanisms;

Figure 14 is a section taken along the line 14-14 of Figure 13;

Figure 15 is a section taken along the line 15-15 of ii gure 13;

Figure 16 is a section taken along the line 161o of Figure 14; and

Figure 1-7 is a view similar to Figure 5, showing another construction for certain of the mechanisms.

Referring to Figures 1 and 2, elevator .car 20, moving in shaftway 21, is provided with a car door 22 or other. suitable closure for the entranceway or passenger opening in the elevator cab. 135 The car door 22 is shown in Figures 1 and 2 in its closed position. Elevator car is provided with a framework 23 above the elevator cab and suitably secured to the car frame. Upon the framework 23 is mounted an engine assembly 40 comprising motor 2%, mechanical brake 25, reduction gearing 26---whlchv is preferably a selflocking worm gear reduction-, crank wheel 27 and a switch box 28. Also upon framework 23 is pivotally mounted, as upon pin 30, a four-armed bell crank having arms 31, 32, 33, 34. The outer end of arm 31 and a crank pin 35 on crank wheel 27 are connected by means of a flexible tensioning member such as chain 36. To arm 33 is secured a door operating arm 3'7, the end of which 150 end of a tension is connected to'car door22 through the intermediary of link 38.- To arm- 34 is connected one spring 40, asby means of chain 41, the other end of this spring being appropriately secured to framework 23. To arm 32 is secured the body of a da'sh'pot 42, the piston rod 43 of the dashpot being pivotally fastened to a frame 44 which in turn is appropriately secured to framework 23. The outer end of arm 32 is provided with a series of tapped apertures through any one of which a threaded pin 45 may be secured so that a smooth surface of such pin projects into the vertical With the parts as-shown in Figures 1 and 2, energization of motor 24 for opening the doors and the resulting rotation of shaft 46 at fast speed and shaft 47 at slow speed, causes crank wheel 27 to rotate clockwise. Car door 22 is thus opened. During the opening operation, spring is tensioned. When crank wheel 2'7 has rotated substantially one-half a revolution, and,

moved car door 22 to open position, an adjustable cam 48 on crank wheel 2'7 engages the actuating roller of the door open limit switch 50, with the result that motor 24 is deenergized. The car door is held in open position by mechanical means while the motor is deenergized, as hereinafter appears.

The closing of car door 22 is effected by the ac-' tion of spring 40. During the door closing operation, however, motor 24 is energized so as to cause rotation of crank wheel 2'7 in counterclockwise direction, so that the speed with which the car door is closed is controlled in such fashion that the maximum car door closing speed cannot exceed the speed corresponding to the speed of the motor. Shortly before car door 22 reaches closed position, to cushion the final closing movement of the car door. The closing operation of motor 24 is terminated, and the motor deenergized, when adjustable cam 51 on crank wheel 2'7 engages with the operating roller of door closed limit switch 52.

It is to be observed that as car door 22 approaches open position, arm 32 of the four-armed bell crank rotates into a position such that pin on arm 32 engages with chain 41 and distorts the straight line connection between arm 34 and spring 40into an angular connection. The resulting additional fiexure of spring 40 assists in retarding the car door as it nears open position and also provides in spring 40 additional energy for starting the car door closed from open position. The amount of ultimate angularity introduced into chain 41 by pin 45 may be varied by inserting pin 45 in the different holes at the end of arm 32.

A brake is preferably provided for motor 24, and for simplicity is entirely mechanically actuated, as is evident in Figures 2 and 3. With this arrangement, the drum 53 of the brake is mounted upon high speed shaft 46, with a brake shoe 54 for engagement with this drum pivotedas at 55 and provided with an arm 56 against which acts a spring 5'7 for biasing brake shoe 54 into engagement with drum 53. The brake is released by a cam 58 secured to slow speed shaft 47, cam 58 engaging with a-roller 60 onarm 56 shortly after crank wheel 27 moves from its position corresponding to door closed position, cam 58 continuing in engagement with roller 60, maintaining the brake released, while the door is opening, and cam 58 disengaging from roller 60 to cause the application of the brake, shortly before crank wheel 27 reaches a position corresponding to door plane containing chain 41.,

dashpot 42, 43 becomes efiective o en position, and thus shortly before the door attains door open position. It is to be observed that with this arrangement motor 24, for a short period at the start of 'both the opening and the closing operations, drives through the braking action caused by the engagement of brake shoe 54 with drum 53. This is not objectionable and may be effected without increasing the capacity,

of the motor since at the times motor 24 drives through the brake in order to effect its release, the harmonic motion of crank pin 35 on crank wheel 2'7 is such that the power required of motor 24 for actuating or controlling thecar door 22 is very small.

If desired, a suitable car door interlock switch 61 may be arranged to be actuated from arm 31 of the four-armed bell crank.

There is secured to car door 22, preferably at the rear thereof, a cam 66 formed of a flat strip of plate mounted so that the plane of the plate is vertical, and perpendicular to the plane of the sliding hatchway doors 6'7. Thus, as car door, 22 is moved from closed to open position, and vice versa, cam 66 is moved correspondingly.

Cam 66' cooperates with mechanisms for the hatchway door as illustrated in Figures 4 and 5 and in certain of the remaining figures. These mechanisms may be divided into two parts, the hatch door lock assembly, generally designated 68, which is mounted upon the hatch door 6'7, and the interlock switch assembly, generally designated '70, which is stationarily mounted in the ele- Figure 2) which in turn is secured to the hatchway door6'7, preferably at the rear edge thereof. Upon the upper arm of bell a pin 7'7 parallel with pins '73 and '74. Pin '77 extends through an aperture in the upper arm of bell crank '71, this aperture being such that there is no lost motion between pin 7'7 and bell crank '71 during the normal relative motion between bell cranks 71 and '72. As a result of the foregoing construction, rotation of either bell crank 71 or '72 about its corresponding pivot in either direction causes rotation of the other bell crank in the same direction. However, since, within the range of motion of bell crank '71 herein involved, the distance between pin '7'? and pin '13 is substantially constant and since the arrangement is such that the distance between pin '77 and pin '73 is considerably greater than the distance between pin '77 and pin I4-being in the illustrated construction in the ratio of about 2 to l-a given amount of rotation of. bell crank 71 produces a considerably larger amount of' rotation of bell crank '72.

The upper arm of hell crank '71 is arranged to engage a suitable stop for limiting the clockwise rotation of this arm. Such a stop is conveniently obtained by utilizing a portion of the over to form an inverted U-section at the upper portion of such base member. Appropriate sound-deadening material 80, such as rubber or crank '72 is secured leather, is preferably secured to. the upper arm of bell crank 71 so as to provide a suitable bumper for bell crank 71 when it engages with the yoke between base member 75 and extension 78.

Each of the two downwardly extending arms of bell cranks 71 and 72 is provided with a suitable abutment, such as a roller or the like, for engaging car door cam 66 on opposite sides thereof. The outer surfaces of these rollers, 81 for bell crank 71 and 82 for bell crank 72, are preferably of resilient material such as rubber, arranged over a' suitable sleeve. Roller 81 is mounted upon a downwardly extending arm of bell crank 71 by means of a pin 83, the enlarged portion of which co-axial with roller 81 is eccentrically related to the reduced portion of pin 83 fitting into the lower arm of bell crank 71. Roller 81, and thus the car cam engaging member of bell crank 71, may beadjusted relative to car cam 66 by rotating pin 83. By means of a suitable slot in bell crank 71 and by means of a clamping screw 85, pin 83 may be secured in any adjusted position. In a similarinanner, roller. 82 is mounted by pin 84 on the downwardly extending arm of bell crank '72 and may be clamped in position by bolt 86. 4

Means is provided for latching bell cranks 71 and 72 together at certain times so as to prevent clockwise rotation of these bell cranks, as viewed in Figures 4, 5 and 6. It is preferred that such latching means comprise a catch member 87 pivotallysupported upon the reduced portion of pin 83 and having a catch 88 formed therein for cooperation with the reduced portion of pin 84 on bell crank 72. Catch member 87 extends beyond the catch 88, with the under surface ofsuch extension suitably shaped, for purposes as will hereinafter appear.

The upper arm of hell crank 71 extends for a distance beyond pin 77 and is so configurated as to form a latch hook having a shoulder 90, an inclined surface 91 and an under surface 92. Inclined surface 91 may have therein a suitable bumper 93 made of leather or the like, the purpose of which will appear as the description proceeds.

Interlock switch assembly 70 comprises a casing 94 (see Figure 4) suitably secured to the building structure and having an aperture therein for receiving the latch hook portion of bell crank 71. Casing 94 is provided with a lip or keeper 95 for cooperation with shoulder 90 on bell crank 71. Within casing 94 is an interlock switch cooperating with the latch hook portion of bell crank 71 in such a manner that the contacts thereof are disengaged except when the latch hook portion of bell crank 71 is within the casing and keeper lip 95 is effective to prevent withdrawal of such latch hook portion, at which time the contacts thereof are in engagement. Such an interlock switch may be constructed in numerous forms. One very satisfactory form for such a switch is shown in United States. Patent No. 1,569,669. A diagrammatic representation of an interlock switch somewhat similar to the switch of saidpatent is shown in Figure 5. A member 96 of insulatingmaterial, suitably ar ranged for vertical reciprocating motion, has a conductive pin 97 mounted thereon for completing a circuit between contact members 98 and 99 when movable member 68 is in such a position that pin 97 is in engagement with contacts 98 and '99. Also mounted on movable member 96 is a pin 101 for engaging the inclined surface 91 of the hooked portion of bell crank 71. Pref- 1 a suitable covering sleeve. Pin 104 cooperates at certain times with the under surface of catch member 87 as will hereinafter appear.

Pivotally supported upon U-member 103, near the yoke thereof, is a rocker arm 105. The end of rocker arm 105 opposite the aperture in casing 94 is continuously urged downwardly by the action of a compression spring 106 through the intermediary of a vertical pin l07,spring 106 and pin 107 being suitably supported on casing 94. The other end'of rocker arm 105 has mounted thereon a roller 108 for engaging undersurface 92 of bell crank 71 at certain times, as will hereinafter appear.

Summarizing the operations of the mechanisms for the hatchway door, it is first to be noted that Figures 4 and 5 show the positions of thesemechanisms at the time'the hatchway door 67 is closed and locked'and theelevator car is in motion or capable'of being moved. At this time car door 22 is in closed position and car door cam 66 is in a vertical plane intermediate the rollers 81 and 82. This condition exists at each hatchway door and as a consequence car door cam 66, as the elevator car travels up and down the hatch way, has on each side of the cam an appropriate clearance between. the set of rollers 81 and 82 for each hatchway door. In the event the c1earance between car door cam 66 and all of rollers 82 is not uniformas might result from misalignments of the hatchway mechanism during installationsuch a condition is easily corrected by adjusting pins 84 for such rollers. Similarly, the clearance between car door cam 66 and all of rollers 81 may be made uniform by adjusting pins Considering the mechanisms in their positions M as shown in Figures 4 and 5, the latch hook portion of the upper arm of bell crank 7l-is within the casing 94 of interlock switch assembly 70. Spring 106, through the intermediary of pin 107, rocker arm 105 and roller 108, maintains the upper arm of bell crank 71 in its uppermost position, in which position bumper 80 is in engagement with its stop. In this position shoulder 90 at the latch hook end of bell crank 71 is in alignment with keeper lip 95 of casing 94. As a consequence, hatch door 67 is locked in its closed position. Pin 101 is resting on the inclined surface 91 and as a consequence member 96 is maintained in the position in which pin 97 completes the circuit between contact members 98 and 99. The lower surface of catch member 87 is in engagement with pin 104 and bell crank 72 is in such a position that the reduced portion of pin 84 is displaced from catch 88 on catch member 87. M0

The first motion of the car door as it moves from closed position toward open position results in taking up the clearance between car door cam 66 and roller 81. Subsequent motion of the car door in the opening direction results in car 145 door cam 66 causing counterclockwise rotation of hell crank 71. Such rotation of bell crank 71 first results in the downward movement of member 96 and consequent disengagement of pin 97 from contacts-98 and 99 so that the circuit between 150 in engagement with the these contacts is broken. Such downward movement of member 96 may be the result of its inherent weight alone, or with the assistance of a spring. In the event that member 96 fails to move downwardly under these influences, it is positively actuated in the down direction due to the engagement of the under surface 92 at the latch hook end of bell crank '71 with cross piece 102 on member 96. During such counterclockwise rotation of bell crank '71, spring 106 is.compressed and shoulder moves out of alignment with keeper lip 95. Also during such counterclockwise rotation of bell crank '71, bell crank '72 rotates counterclockwise, being caused to do so by the action of pin 7'7 connecting bell crank '72 with bell crank '71.

Figure 10 shows the position of the parts when bell crank 71 has moved sufficiently to have shoulder 90 clear keeper lip 95. Hatchway door 67 is now unlocked and may be moved from closed position. Further motion of the car door in the opening direction results in hatchway door 6'7 being moved in the opening direction.

When hatchway door 67 has been moved from closed position toward open position sufiiciently far so that the latch hook end of bell crank '71 is not in casing 94 and its under surface 92 is not roller on rocker arm 105, the parts are in the positions shown in Figure 11. In attaining this position, car door cam 66 causes further counterclockwise rotation of bell crank '71 from the position shown in Figure 10. During this additional rotation of bell crank '71, bell crank '72 also rotates counterclockwise until roller 82 thereon is in engagement with car door cam 66, when catch member 8'7 drops into place with catch 88 in engagement with the reduced portion of pin 84. Thus, the running clearances between car door cam 66 and rollers 81, 82, existing when the parts are as shown in Figure 5, have been eliminated when the parts are as shown in Figure 11. Further, when the parts are as shown in Figure 11, hatch door 67 is firmly secured to car door 22', this by virtue of the fact that catch member 88 locks bell cranks '71, '72 in the position in which rollers 81, 82 thereon are in engagement with the opposite sides of car door cam 66. From the time the parts are in the position shown in Figure 11, during the remainder of the door opening operation, car door 22 and hatch door 6'7 move as a unit, with no relative motion or play existing between the doors. This contributes to smooth and quiet operation of the car and hatchway doors.

During door closing operation, the closing of car door 22 causes corresponding movement .of car door cam 66, which is toward the left as viewed in Figure 11. Car door cam 66 thus exerts pressure upon roller 82 of bell crank '72, but clockwise rotation of bell crank '72 (and also ofbell crank '71) is prevented by catch member 8'7. Hatch door 67 is therefore firmly secured to car door 22 during door closing operation similarly as during door opening operation, except when the doors are near their closed positions, as will appear as the description proceeds. Thus, during door closing operation as well as door opening operation, hatch door 67 and car door 22 operate as a unit, with no relative motion or play between ,them. Among the many advantages of such an arrangement is the fact that if the direction of motion of ca door 22 is changed during door opening or door closing operation-or even if the speed of car door 22 is suddenly changed during door opening or door closing operationhatch door 67 follows the change in direction or .crank '72, is receding from car speed of car door 22 instantly and without the noise and jars usually incident to such changes when play exists between the car door and the hatchway door.

It is understood that, although it is preferred to have the running clearances between cam 66 and rollers 81, 82 eliminated entirely while the hatch door 67 is actuated by cam 66, as effected in the illustrated construction, the hatch door lock assembly may be arranged, if desired, merely to reduce such running clearances to a smaller value than those existing when the doors are in closed position and. the car is in motion. This may be effected by providing suitable means for engaging one or the other of the bell cranks '71, 72 to prevent their counterclockwise rotation to the extent of having roller 82 engage with cam 66.

As the car and hatchway doors approach closed position, under surface 92 at the latch hook end of bell crank '71 engages with the roller on rocker arm 105, thereby compressing spring 106. Figure 11 is illustrative of the position of the parts just before under surface 92 at end of bell crank '71 engages with the roller on rocker arm 105. Figure 12 is illustrative of the position of the parts when, during door closing operation, hatch door 6'7 is substantially in closed position, at which time spring 106 is compressed its maximum amount.

It is to be noted that while hatch door 67 moves toward closed position from the position represented by Figure 11 into the position represented by Figure 12, the under surface of catch member 8'7 engages with and rides upon pin 104. The under surface, of catch member 87 is suitably shaped so that as hatch door 6'7 moves toward closed position, catch member 8'7 is raised as a result of its engagement with pin 104. In the position of the parts illustrated in Figure 12, catch member 8'7 is raised almost to the point where the reduced portion of pin 84 on bell crank '72 is not caught by catch 88 of catch member 8'7.

Further motion of car door 22, and thus of car door cam 66, toward closed position from that illustrated in Figure 12, results, during the first increment of such motion, in the movement of hatch door 6'7 toward closed position an amount suflicient to raise catch member 8'7 so that catch 88 is no longer effective to lock bell cranks '71 and '72. This first increment of motion is, as may be seen by reference to Figure 12, very small. At the time that catch member 8'7 releases, hatch door 6'7 is in door closed position. Car door 22, however, still has further door closing motion before it attains door closed position. As car door 22 is moved through ment, spring 106 causes clockwise rotation of bell cranks '71 and '72. Such clockwise rotation of bell crank '71 causes the latch hook end thereof to raise so that shoulder 90 is in alignment with keeper lip 95. Such clockwise rotation of hell crank '71 also causes the engagement of inclined surface 91 with pin. 101 on movable member 96 and thus causes upward movement of member 96.

While bell crank '71 is rotating clockwise under the action of spring 106, roller 81 of bell crank'71 is maintained in engagement with car door cam 66. However, during this time, roller 82, on bell door cam 66 as a result of the fact that the rate of angular motion of bell crank '72 is greater than the rate of angular motion of bell crank '71. When Sprin 106 has rotated bell crank '71 so that the bumper thereon engages the stop therefor, the latch hook end of bell crank '71 is raised to the position in the latch hook i this final door closing movesumes the position illustrated in Figure 5. At that instant, however, car door cam 66 is in engagement with roller 81 on bell crank '71. Subsequent motion of car door 22-to its closed position results in car door cam 66 disengaging from roller 81 and in taking the position for car door cam 66 illustrated in Figure 5. The equipment is then in its original position, with both the car and hatchway doors in fully closed position and with running clearances established on both sides of car door cam 66.

It is to be observed that, in the event the door opening operation is commenced while elevator car 20 is being inched or brought level with the landing at which hatchway door 67 is provided, the resulting. vertical motion of the elevator car, and thus of car door cam 66, with respect to the hatch door lock assembly 68, does not interfere with the door operations. This is due to the fact that rollers 81 and 82 are free to roll on the surfaces of car door cam 66.

' Although the mechanism associated with the hatchway door shown in Figures 4-9 may be employed in conjunction with any type of operating equipment for the car door, it is preferred that the car door'be operated by mechanism as shown in Figures 1, 2 and 3. Such car door operating mechanisms, in addition to their simplicity, em-

. body the feature that the doors are spring closed,

with provision that in the event a door strikes an obstruction during closing operation, the continued operation of the door motor does not affect the doors or render difilcult the release of the obstruction. Such car door operating mechanisms also embody the feature that, in the event of failure of the power for the-door motor or in the event of a mechanical or electrical failure of the door operating mechanism preventing normal'operation thereof, a person within the elevator car may manually open the car and hatchway doors and effect an exit from the elevator car. The manual opening of these doors may be effected by manually causing the opening of car 66 door 22 against the action of spring 40.- Slack is thereby developed in chain 36 so that the manual opening of the car door is effected without causing movement of any of the parts of gearing 26 or of driving motor 24. The manual opening of car door 22 causes the opening of hatch door 67 in a manner precisely the same as occurs when car door 22 is opened under normal conditions. The closing of car door 22 and hatch door 67 is effected by spring 40, similarly as with normal door closing operation, without, however, there being any control of the door closing speed as efi'ected by motor 24 during normal door closing operation. Dash-pot 42, 43, however, checks the closing speed of the doorsas they near closed position similarly as in normal operation and prevents slamming of the doors.

. The circuits for controlling door motor 24 have not been shown as any suitable set of circuits may be employed. It is preferred, however, to utilize circuits which cause the door motor to open 1,960,150 which shoulder 90 is in alignment with keeper the car-door, and the hatchway door at a floor opposite which the elevator car has stopped, automatically as an incident of the stop at such floor.

Figure 13 illustrates the hatchway door mechanism, as shown in Figure 5, together with additional mechanisms enabling one to unlock and open the hatchway door from without the hatchway. Two mechanisms for unlocking and opening the hatch door are shown in Figure 13. One

of such mechanisms is shown in more detail by Figure 14, while the other of such mechanisms is shown in more detail by Figure 15. Either or both of these mechanisms may be employed as desired, and as the exigencies of safety require.

The hatch door unlocking and opening mechanism shown in Figure 14 is operated by a. key 120 inserted through an aperture 121 in a plate 122 secured to the landing side of hatch door 67 near the rear upper corner thereof. On the opposite side of hatch door 67 is mounted a member 123 arranged for movement in a plane parallel to the plane of hatch door 67. In the construction illustrated, the motion of member 123 is shown as rectilinear, being guided by supports 124 and 125. With corresponding changes to the related equipment, however, member 123 could, if desired, be suitably shaped and mounted so as to have curvilinear motion parallel to the plane of hatch door 67. Member 123 has a lip 126 at right angles thereto arranged to engage with a portion of the roller armof bell crank 72 when member 123 is displaced from its normal position. The

normal position of member 123 is with lip 126- retracted from bell crank 72, due to the action of a spring 127. When, however, key 120 is inserted through hatch door 67 so that its end engages with the edge of member 123 and key 120 is swung about plate 122 as a pivot, lip 126 of memher 123 engages with bell crank '72 and causes counterclockwise rotation thereof, as viewed in Figure 13. This produces counterclockwise rotation of bell crank 71, with the result that hatch door 67 is unlocked. Hatch door 67 may then be opened. It is to be observed that with the mechanisms shown in Figure 14, hatchway door 67 may be opened from outside the hatchway regardless of whether or not elevator car 20 is opposite the floor for which hatchway door 67 is provided.

Figure 15 shows a hatchway door unlocking and opening mechanism which is eflective to open the hatchway door only when the elevator car is opposite the floor for which such hatchway door is provided. The mechanism illustrated in this figure is operated by a key 130 inserted through a suitable aperture 131 in plate 122. Key 130 cooperates with a member 132 supported on the hatchway side of hatchway door 67, similarly as member 123 is supported. Member 132 has a. lip 133 arranged to engage with car door cam 66 when member 132 is displaced from its normal position. The normal position of member 132 is one in which lip 133 is retracted from car door cam 66, due to the action of a spring 134. When key 130 is inserted through aperture 131 so that its end is in engagement with the edge of member 132, and key 130 is swung about plate 122 as a pivot, lip 133 of member 132 is moved to the right as viewed in Figures 13 and 15. In the event the car is opposite the floor for which hatchway door 67 is provided, lip 133 engages with car door cam 66. Subsequent motion of member 132 by key further motion of member 132 by key 130 causes counterclockwise rotation of bell crank 71, thus unlocking hatchway door 67. Hatchway door 67 may now be opened.

It is to be observed that in the event the elevator car is not opposite the floor for which hatchway door 67 is provided, lip 133 does not engage car door cam 66, nor does it engage with any portion of bell crank 71 or roller 81. As a consequence, hatch door 67 can be unlocked from without the hatchway by the mechanism of Figure 15 only when the elevatorcar is opposite the floor for which such landing door is provided. This feature contributes to the safety of the elevator installation.

As previously mentioned, either the mechanism illustrated in Figure 14 or the mechanism illustrated in Figure 15 may be employed. It is preferred, however, that both of these mechanisms be employed on at least one of the hatchway doors in the elevator installation-preferably for the door at the lowest floor servedwith keys of different shapes and sizes so that the key for one mechanism cannot be used with the other mechanism. This is illustrated by Figures 14, 15 and 16, wherein key 130 is a solid round rod for insertion through a circular aperture 131 in plate 122, and wherein the portion of key 120 inserted through hatchway door 67 is a rod of a diameter larger than that of key 130 with a lunar or crescent shaped section fitting the lunar or crescent shaped aperture 121 in plate 122. Key 130 is termed the service key and is furnished the elevator operators so as to enablethem to obtain access to the elevator car while it is parked at the floors for which mechanisms of the character shown in Figure 15 are provided. Key 120 is termed the emergency key or firemans key in that it affords access to the elevator shaftway for emergencies, such as fires, when such access is desired even if the elevator car is not opposite the floor. It is preferred that key 120 be kept in a locked case having a glass cover, positioned near the elevator hatchway at the fioor or floors having mechanisms of the character shown in Figure 14, so that key 120 will not be used except under real emergency conditions.

Figure 17 illustrates a construction somewhat different structurally from that heretofore described, but embodying many of the features thereof. The interlock switch assembly 136 is similar to assembly '70 (see Figure 5) and has a compression spring 137, a rocker arm 138 and a pin 140 corresponding respectively to compression spring 106, rocker arm 105 and pin 104 illustrated in Figure 5.

The hatch door lock assembly 141, secured to hatch door 142 similarly as assembly 68, differs from assembly 68 in that hatch door lock assembly 141.employs a single-arm or bell crank 143. Bell crank 143 is pivotally mounted. as at 144, upon base member 145 and is provided with two rollers or other members 146, 147 for engaging a car door cam 148 similar to car door cam 66. The rollers may be adjustably mounted upon the downwardly extending arm of bell crank 143 similarly as rollers 81, 82 are mounted upon bell cranks 71, 72. The upper armof bell crank 143 is arranged to engage a stop formed by base member 145, similarly as is illustrated in Figure 5. for limiting the clockwise rotation of this arm. The upper arm of bell crank 143 extends beyond this stop and is so configurated as to form a latch hook having a shoulder 150, an inclined surface 151 and an under surface 152 corresponding respectively to shoulder 90, inclined surface -91 and under surface 92 illustrated in Figures 5 and 6.

Pivotally secured to bell crank 143, as at the support for roller 146, is a catch member 153 having a shoulder or catch formed therein for cooperation with a pin 154 mounted on base member 145. Catch member 153 extends beyond the catch formed therein, with the under surface of such extension suitably shaped to release the catch from pin 154 upon the cooperation of pin 140 and the under surface of such extension.

Bell crank 143 is so formed, and the rollers 146 and 147 are so mounted thereon that upon the engagement of one side of car door cam 148 with roller 146 during the initial stages of door opening operation, and the consequent counterclockwise rotation of bell crank 143, roller 147 is moved into engagement with the other side of car door cam 148, to thereby take up the running clearance existing between cam 148 and rollers 146, 147 when the doors are in closed position and the car is in motion. Also during theinitial stages of door opening operation the circuit through the interlock switch contacts is broken and the latch hook end of bell crank 143 disengages from the keeper lip on the case of interlock switch assembly 136, similarly as with the latch hook end of bell crank '71 in Figure 5. When car door cam 148 is engaged 'on both sides thereof by rollers 146 and 147, catch member 153 drops into place to retain bell crank 143 in its rotated position. Hatch door 142 is thus securely fastened to car door cam 148 (and therefore to the car door) during the door opening and closing operations similarly as withthe two-bell-crank construction illustrated in Figure 5.

Upon the return of the hatchway door to closed position, the under surface of the extension of catch member .153 engages with pin 140 to release the catch for cell crank 143, similarly as pin 104 and the under surface of the extension of catch member 87 cooperate, in the construction illustrated in Figure 5, to release bell cranks 71. 72. When the car and hatchway doors are in their fully closed position, spring 137 maintains the hatchway door locked and the running clearances between car door cam 148 and rollers 146, 147 similarly as spring 106 effects corresponding functions in the constructon illustrated in Figure 5 As with the construction illustrated in Figure 5, the hatch door lock assembly 141 may be arranged to reduce the running clearances rather than eliminate them entirely.

Also it is believed clear that the one-bell-crank construction illustrated in Figure 7 may be provided with either or both of the mechanisms such as illustrated in Figures 1316 for opening hatchway door 142 from the landing side thereof under service or emergency conditions.

It is to be observed that spring 106, of the twobell-crank construction illustrated in Figure 5. is a part of the interlock switch assembly 70 mounted upon the hatchway and that it urges bell crank 71 clockwise, when the hatchway door is in, and adjacent. its closed position. through r the intermediary of rocker arm 105. If desired, spring 106 may be transferred to the hatch door lock assembly 68 mounted upon the hatchway door, the spring then being arranged to urge bell crank '71 clockwise by having such spring act between the downwardly extending arms of bellcranks 71, 72 or act between either bell crank 71 or 72 and base member 75. When spring 106 is thus transferred to the hatch doorlock assembly. rocker arm 105 may be eliminated.

The preferred location for spring 106, however, is as illustrated in Figure 5.

Spring 137 of the one-bell-crank construction illustrated in Figure 17 may, in a similar fashion,

be transferred to hatch door lock assembly 141 mounted on the hatchway door. As with spring 106, however, the preferred arrangementoi spring 137 is as shown in Figure 17.

The hatchway door is preferably mounted on two rollers 160 (see Figures 4 and 9) running in the curved lower-portion of a door track 161 of J cross section. Rollers 160 preferably have a curvature somewhat smaller than that of the portion of door track on which they operate. In order to reduce the track wear-due, it is believed, to comparatively large unit pressures at the points of contacts of rollers 160 with door track 16l-the curved portion of the door track in which the rollers operate is bent up, as at 162, at each end of the door track and lubricating oilis placed in the reservoir formed thereby. The rollers 160 thus operate in a trough of oil and it has been found that track wear is thereby very materially reduced.

The door hangers and track for the car door are preferably of similar construction.

Attention is directed to the fact that while cam 66 has been shown and described as secured to the car door, it may be mounted in any convenient fashion on the elevator car and provided with motion between two limiting positions corresponding to door open position and door closed position.

It is to be understood that the features of the invention involving the unlocking of the hatchway door from the landing side thereof, are applicable to elevator installations in which a cam or similar device on the car normally unlocks the hatchway door, but which does not in addition cause movement of the hatchway door, as with cams 66 and 148 illustrated herein. Thus, the mechanisms actuated by the service key 130 and by the emergency key 120, or either of them may be applied to unlock a hatchway door which is normally unlocked by a movable device such as a retiring cam, carried on the elevator car.

The term cam as herein employed is not restricted to a single plate as illustrated but includes channel chambers, lugs or any other device or devices mounted on the car and adapted to engage cooperating devices for the hatchway door.

What is claimed is:

1. In an elevator installation in which a door is provided at a landing served by the elevator car; a cam mounted on said car for movement between two limiting positions; and means associated with said door for causing said motion of said cam to be mechanically transmitted to said door and thereby efiect the opening and closing thereof, said means comprising; two members, one adapted to be engaged by said cam in the door opening operation, and the second adapted to be engaged by said cam in the door closing operation; mechanism, efiective when said door is in closed position and said cam is in its limiting position corresponding to door closed position, for establishing and maintaining running clearances between both of said members and said cam, and effective as a result oi. the engagement of said cam with one of said members during the initial stages of door opening operation, for causing the second of said members to move toward said cam so as to take up clearance between said cam and said second member;

means for maintaining said members in the positions they occupy with respect to each other and to said door resulting from such engagement of said cam with said one member so that said door is actuated by said cam in door opening and door closing directions without appreciable lost motion; and means, effective when said door, during door closing operation, attains closed position, for releasing the last mentioned means to enable said mechanism to establish running clearances between both said members and said cam as said cam moves'the balance of the distance to its limiting position corresponding to door closed position.

2. Mechanism for operating an elevator hatchway door from the elevator car, comprising; a pair of members; a cam interposed between said members when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement in a plane parallel to said hatchway door to effect the opening and closing thereof; mechanism, including means mounting said members upon said hatchway door, actuated as an incident to the engagement of said cam with one of said members as said cam is moved in the door opening direction from an initial position corresponding to door closed position, to cause the second of said members to move toward said cam to reduce clearance between said second member and said cam; means maintaining said mechanism in its actuated position so that, while said mechanism is so maintained and said hatchway door is operated by said cam in door opening and doorclosing directions, there is a minimum of play between said hatch way door and said cam; means, efiective when said hatchway door, during door closing operation, attains substantially door closed position, for causing the release of said maintaining means; and means, effective upon the operation of said releasing means and the return of said cam to said initial position corresponding to door closed position, for actuating said mechanism so that running clearances are established and maintained between said cam and both of said members.

3. In an elevator installation in which a door is provided at a landing served by the elevator car; a cam mounted on said car for movement between two limiting positions; and means associated with said door for causing said motion of said cam to be mechanically transmitted to said door and thereby efiect the opening and closing thereof, said means comprising; two members mounted on said door, one adapted to be engaged by said cam in the door opening operation, and the second adapted to be engaged by said cam in the door closing operation; means .connecting said members and responsive to movement of one of said members relative to said door as a result of the engagement of said cam with such member during the initial stages of door opening operation, for causing the second of said members to move toward said cam so as to take up clearance between said cam and said second member; a latch for maintaining said members in the positions they occupy withrespect to each other and said door resulting from the operation of said last preceding means so that said door is actuated by said cam in door.

opening and door closing directions without appreciable lost motion; means, eflective when said door; during door closing operation, attains closed position, for releasing said latch; and spring means, effective upon the release of said latch and the movement of said cam the balance of the distance to its limiting position corresponding to door closed position, for actuating said members to obtain and maintain running clearances between said cam and both of said members.

4. Mechanism for operating an elevator hatchway door from the elevator car, comprising; a pair of members; a cam interposed between said members when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement in a plane parallel to said hatchway door to efiect the opening and closing thereof; mechanism, including means connecting said members and mounting them upon said hatchway door, efiective as an incident to the engagement of said cam with one of said members as said cam is moved in the door opening direction from an initial position corresponding to door closed position, for causing the second of said members to move toward said cam to reduce clearance between said second member and said cam; locking means mounted on said hatchway door locking said mechanism'in its actuated position so that, while said mechanism is so locked and said hatchway door is actuated by said cam in door opening and door closing directions, there is a minimum of play between said hatchway door and said cam; means mounted upon the hatchway adjacent said hatchway door and effective when said hatchway door, during door closing operation, attains substantially door closed position, for causing the release of said locking means; and spring means mounted upon the hatchway adjacent said hatchway door and effective upon the operation of said releasing means and the return of said cam to said initial position corresponding to door closed position, for actuating said mechanism so that running clearances are established and maintained between said cam and both of said members, said spring means being ineffective to control said mechanism after said hatchway door moves from door closed position.

5. In an elevator installation in which a door is provided at a landing served by the elevator car; a cam mounted on said car for movement between two limiting positions; and means associated with said door for causing said motion of said cam to be mechanically transmitted to said door and thereby efiect the opening and closing thereof, said means comprising; two members for engaging said cam on opposite sides thereof mechanism, including means mounting said members on said door for movement relative thereto, efiective when said door is in closed position and said cam is in its limiting position corresponding to door closed position, for establishing and maintaining running clearances between both of said members and said cam, and responsive to movement of one of said members relative to said door as a result of the engagement of one side of said cam with such member during the initial stages of door opening operation, for causing the second of said members to move into engagement with the opposite side of said cam; means for maintaining said members in-such engagement with said cam so that said door is actuated by said cam in door opening and door closing directions without play between said cam and said door; and means, effective when said door, during door closing 0pcraton, atta ns closed position, for releasing the last mentioned means to enable said mechanism to establish running clearances between both said members and said cam as said cam moves the balance of the distance to its limiting position corresponding to door closed position.

' 6. Mechanism for operating an elevator hatchway door from the elevator car, comprising; a pair of bell cranks each provided with an abutment on an arm thereof; a cam interposed between said abutments when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement parallel to said hatchway door to effect the opening and closing thereof; mechanism, including means pivotally mounting said bell cranks upon said hatchway door and means operatively connecting said two bell cranks, effective as a result of the engagement of said cam with the abutment on one of said bell cranks as said cam is moved in the door opening direction from an initial position corresponding to door closed position, for causing the abutment on the second of said bell cranks to move toward said cam to reduce clearance between such abutmenton said second bell crank and said cam; means maintaining said bell cranks in their positions resulting from such operation of said mechanism so that while said bell cranks are so maintained, said hatchway door is actuated by said cam in door opening and door closing directions with a minimum of play; means, efiective when said hatchway door, during door closing operation, attains substantially door closed position, for causing the release of said maintaining means; and means, efiective upon the operation of said releasing means and the return of said cam to said initial position corresponding to door closed position, for actuating said bell cranks so that running clearances are established and maintained between said cam and the abutments on both of said bell cranks.

'7. In an elevator installation in which a door is provided at a landing served by the elevator car; a cam mounted on said car for movement sociated with said door for causing said motion of said cam to be mechanically transmitted to said door and thereby effect the opening and closing thereof, said means comprising; two bell ill) between two limiting positions; and means ascranks each having an abutment on an arm thereof, one abutment adapted to be engaged by said cam in the door opening operation, and the second abutment adapted to be engaged by said cam in the door closing operation; means, secured to said door, mounting said bell cranks for pivotal movement relative to said door; operative con-.

nections between said bell cranks so that movement of one of said bell cranks relative to said door, incident to the engagement of said cam with the abutment on such bell crank during the initial stages of door opening operation, actuates the second of said bell cranks to move its abutment toward said cam so as to take up clearance between said cam and the abutment on said second bell crank; locking means mounted on said door locking said bell cranks in the positions they occupy with respect to each other and said-door resulting from the operation of said second bell crankby said first bell crank during the initial stages of door opening operation so that said door door and effective when said door, during door closing operation, attains substantially closed position, for releasing said locking means; and spring means, mounted upon the hatchway adjacent said door and engaged by one of said bell cranks when said door' is in closed position, for actuating both said bell cranks to positions in which, after said cam moves the balance of its distance to its limiting position corresponding to door closed position, running clearances exist between said cam and the abutments on both said bell cranks, and for maintaining such running clearances while said door is in closed position and said cam is in its limiting position correspondng to door closed position.

8. Mechanism for operating an elevator hatchway door from the elevator car, comprising; a pair of bell cranks each having two arms; two abutments, one on an arm of one bell crank, and the other on an arm of the second bell crank, with the distances between the corresponding axes of rotation of the two bell cranks and the corresponding abutments thereon being approximately the same; a cam interposed between said abutments when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement parallel to said hatchway door to eiiect the opening and closing thereof; means pivotally mounting each of the bell cranks, at its axis of rotation, upon said hatchway door; operative connections between the second arms of said bell cranks for translating rotative motion of the first bell crank in either direction into rotative motion of the second bell crank in the corresponding direction at an angular speed greater than that of the first bell crank so that the engagement of said cam with the abutment on the first bell crank and the consequent rotation of the first bell crank, during the initial stages of door opening operation as said cam moves in the door opening direction from an initial posi' tion corresponding to door closed position, causes the second bell crank to rotate so that the abutment thereon engages said cam on the side opposite that engaged by the abutment on the first bell crank; a latch mounted on said hatchway door for maintaining said bell cranks in the positions in which their abutments are in engagement with said cam on opposite sides thereof so and means, mounted upon the hatchway, including a spring-actuated lever engaging with the second arm of the first bell crank when said hatchway door is substantially inclosed position, effective upon the operation of said latch release and g the return of said barn to said initial position corresponding to door closed position, for actuating said bell cranks so that running clearances are established and maintained between said cam and the abutments on both of said bell cranks.

, 9,. Mechanism for operating an elevator hatchway door from the elevator car comprising; an arm having two spaced abutments thereon; a cam interposed between said abutments when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement parallel to said hatchway door to effect the opening and closing thereof; means pivotally mounting said arm upon said hatchway door so that engagement of said cam with one abutment as said cam is moved in the door opening direction from an initial position corresponding to door closing operation,

recourse arm to move toward said cam to reduce clearance between such second abutment and said cam; means maintaining said arm in the position to which it is moved by said cam so that, while said arm is so maintained and said hatchway door is actuated by said cam'in door opening and door closing directions, there is a minimum of play between said hatchway door and said cam; means, effective when said hatchway door, during attains substantially closed-position, for causing the release of said maintaining means; and means, effective upon the operation of said releasing means and the return of said cam to said initial position corresponding to door closed position, for actuating said arm so that running clearances are established and maintained between said cam and both abutments on said arm.

10. In an elevator installation in which a door is provided at a landing served by the elevator car; a canrmounted'on said car for movement between two limiting positions; and means associated with said door for causing said motion of said cam to be mechanically transmitted to said door and thereby effect the opening and closing thereof, said means comprising; a'bell crank having two abutments thereon, one abutment adapted to be engaged by said cam in the door opening operation, and the second abutment adapted to be engaged by said cam in the door closing operation; means, secured to said door, mounting said bell crank for pivotal movement relative to said door so that movement of said bell crank relative to said door incident to the engagement of said cam with the first abutment during the initial stages of door opening operation, causes the second abutment to move toward said cam so as to take up clearance between said cam and the second abutment; locking means mounted on said door locking said bell crank in the position it 00- cupies with respect to said door resulting during the initial stages of door opening operation so that said door is actuated by said cam in door opening and door closing directions without appreciable lost motion; means mounted upon the hatchway adjacent said door and efiective when said door, during door closing operation, attains substantially closed position, for releasing said locking means; and spring means, mounted upon the hatchway adjacent said door and engaged by said bell crank when said door is in closed position, for actuating said bell crank to a position in which, after said cam moves the balance of its distanceto its limiting position corresponding to door closed position, running clearances exist between said cam and both said abutments, and for maintaining said bell crank in such position vto maintain such running clearances while said door is in closed position and said cam is in its initial limiting position corresponding to door closed position.

11. In an elevatormstallation in which a door is provided at a landing served by the elevator car; a lock for said door with a device for actuating the same; a cam mounted on said car for movement between two limiting positions; and

means associated with said door for causing said motionof said cam to be mechanically transmitted to said lock device and said door and thereby effect the actuation of said lock and the opening and closing of said door, said means comprising; two members, one adapted to be engaged by said cam in the door opening operation, and the second adapted to be engaged by said cam in the door closing operation mechanism, effective when said door is in closed position and said cam is in its limiting position corresponding to door closed position, for locking said door and maintaining it locked and for establishing and maintaining running clearances between both of said members and said cam, and efiective as a result of the engagement of said cam with one of said members during the initial stages of door opening operation, for actuating said lock device to unlock said door and for causing the second of said members to move toward saidcam so as to take up clearance betweensaid cam and said second member; means for maintaining said members in the positions they occupy with respect to each other and to said door resulting from such engagement of said cam with said one member so that said door is actuated by said cam in door opening and door closing directions without-appreciable lost motion; and means, efiective when said door, during door closing operation, attains closed position, for releasing the last mentioned means to enable said mechanism to lock said door and to establish running clearances between both said members and said cam as said cam moves the balance of the distance to its limiting position corresponding to door closed position.

12. Mechanism for an elevator hatchway door, comprising; a door lock for locking said hatchway door in closed position; a pair of members; a cam interposed between said members when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement parallel to said hatchway door between two limiting positions; mechanism, including means mounting said members upon said hatchway door for movement relative thereto and operatively connecting said members to each other and to said door lock, effective when said hatchway door is in closed position and said cam is in its limiting position corresponding to door closed position, for actuating said door lock to lock said hatchway door and maintain it locked and for establishing and maintaining running clearances between both of said members and said cam, and responsive to movement of one of said members relative to said hatchway door as a result of the engagement of one side of said cam with such member during the initial stages of door opening operation by the motion ofsaid cam, for actuating said door lock to unlock said hatchway door and for causing the second of said members to move into engagement with the opposite side of said cam; means for ma ntaining said members in such engagement with said cam so that said hatchway door is actuated by said cam in door opening and door closing direct'ons without play between said cam and said hatchway door; and means, effective when said hatchway door, during door closing operation, attains closed position, for releasing the last mentioned means to enable said mechan sm to effect the locking of said hatchway door and to establish the distance to its limiting position corresponding to door closed position.

13. In an elevator installation in which a door is provided at a landing served by the elevator car; a cam mounted on said car for movement between two limiting positions; and means associated with said door for causing said mo tion of said cam to be mechanically transmitted to said door and thereby efiect the opening and closing thereof, said means comprising; a bell crank having an abutment on an arm thereof adapted to be engaged by said cam in the door opening operation, said bell crank having a latch hook at one end of an arm thereof; a keeper secured to the hatchway for cooperat on with said latch hook for locking said door in closed position; means pivotally mounting on said door said bell crank having the latch hook thereon so that movement of such bell crank relative to said door incident to the engagement of said cam with the abutment on such bell crank during the initial stages of door opening operation causes said latch hook to disengage from said keeper and unlock said door; a second bell crank having an abutment on an arm thereof adapted to be engaged by said cam in the door closing operation; means-pivotally mounting said second bell crank on said door and operatively connecting it to said first bell crank so that the movement of said first bell crank relative to said door from its initial position caused by said cam during the initial stages of door opening operation actuates said second bell crank to move its abutment toward said cam so as to take up clearance between said cam and the abutment on said second bell crank; locking means mounted on said door locking said bell cranks in the positions they occupy with respect to each other and said door as a result of the operation of said second bell crank by said first bell crank during the initial stages of door opening operation so that said door is actuated by said cam in door opening and door closing directions without appreciable lost motion; means mounted upon the hatchway adjacent said door and effective when said door,

during door closing operation, attains substantally closed position, for releas'ng said locking 'means; and spring means, mounted upon the position, for actuating both said bell cranks'to 1 their initial positions in which, after said cam moves the balance of its distance to its limiting position corresponding to door closed position, running clearances exist between said cam and the abutments on both said .bell cranks and said .closed position and sad cam is in its limiting 2 position corresponding to door closed position.

14. In an elevator installation in which a door is provided at a landing served by the elevator car; a door lock for locking said door in closedposition; a cam mounted on said car for movement between two limiting positions; and means associated with said door for causing said motion of said cam to controlsaid door lock and effect the opening and closing of said door, said means comprising; an arm having two spaced abutments, one adapted to be engaged by said cam in the door opening operation, and the second adapted to be engaged by said cam in the door closing operation, said arm alsohaving a door lock actuating portion which, when said door is closed and said arm is in its initial position, renders said door lock effective to lock said door: means, secured to said door, mounting said arm for pivotal movement relative to said door so that pivotal movement of said arm relative to said door incident to the engagement of said cam with the first mentioned abutment during the initial stages of door openingoperation. actuateasa'j'd door lock to unlock said door and causes the second mentionedabutment to move toward said cam so as to take up clearance between said cam and such second mentioned abutment; means maintaining said arm in the position to which it is moved by said cam during the initial stages of door opening operation so that said door is actuated by said cam in door opening and door closing directions without appreciable lost motion; means efiective when said door, during door closing operation, attains substantially closed position, for releasing said maintaining means; and means, eiiectiveupon operation of said releasing means, for actuating said arm to its initial position in which, after said cam moves the balance of its distance to its limiting position corresponding to door closed position, said door lock locks said door in closed position and running clearances exist between said cam and both said abutments and are maintained while said door is in closed position and said cam is in its limiting position corresponding to door closed position.

15, Mechanism for an elevator hatchway door comprising; a bell crank having two spaced abutments thereon, and having a latch hook at one end of an arm thereof; a keeper secured to the hatchway for cooperation with said latch hook for locking said hatchway door in closed position; a cam interposed between said two abutments when the elevator car is opposite said hatchway door; means mounting said cam on the elevator car for movement parallel to said hatchway door to effect the unlocking and the opening and closing thereof; means pivotally mounting said bell crank upon said hatchway door so that rotation of said bell crank, attendant with the engagement of said cam with one of said abutments in the initial stages of movement of said cam in the door opening direction from an initial position corresponding to door closed position, causes said latch hook to disengage from said keeper and unlock said hatchway door and causes the other of said abutments to move toward said cam to reduce clearance between such second mentioned abutment and said cam; locking means mounted on said hatchway door locking said bell crank in its rotated position so that, while said bell crank is so locked and said hatchway door is actuated by said cam in door opening and door closing directions, there is a minimum of play between said hatchway door and said cam; means mounted upon the hatchway adjacent said hatchway door and efiective when said hatchway door, during door closing operation, attains substantially closed position, to cause the release of said locking means; and spring means mounted upon the hatchway adjacent said keeper and engaged by said bell crank when said hatchway door is in closed position, for returning said bell crank to its initial position in which, after said cam returns to said initial position, said latch hook cooperates with said keeper to lock said hatchway door in closed position and running clearances are established between said cam and both said abut- 'ments, and for maintaining said hatchway door 0nd member on the hatchway door so that said second member may move relative thereto, effective, while said first member is in its initial position, for maintaining said second member in an initial position in which it is spaced from said cam on the side thereof opposite which said first member is positioned, and responsive to the movement of said first member from its initial position incident to the engagement of said cam with said first member as the car door moves relative to the hatchway door during an initial portion of door opening operation, for causing said second member to move with respect to the hatchway door in the direction of said cam until said second member engages, or substantially engages, the side of said cam opposite which said first member engages; latch means effective to maintain said first and said second members in their actuated positions, whereby the hatchway door is coupled to the car door so that the two doors are substantiallya single unit during door actuation, both in opening and closing directions; and means efiective when the hatchway door is returned to its closed position, for releasing said latch means, said first and said second members returning to their initial positions during the completion of the car door closing movement after the release of said latch means.

17. Mechanism to be mounted on an elevator hatchway door for effecting actuation thereof by door motive means on the elevator car through the intermediary of a cam arranged for movement on the elevator car parallel to the hatchway door, comprising; a. base plate; a pair of arms pivotally mounted on said base plate; an abutment on each arm at approximately the same distance from the pivot points thereof for cooperation with the opposite sides of the cam; operative connections between said arms for translating rotative motion of one arm in either direction into rotative motion of the second arm in the corresponding direction at an angular speed greater than that of the first arm, rotation of the first arm in one direction decreasing the distance between the two abutments and rotation of the first arm in the other direction increasing the distance between the two abutments; and releasable latch means, efiective when the arms are rotated in the direction to decrease the distance between the two abutments until such distance is substantially equal to the thickness of the cam, for preventing the rotation of the arms in the opposite direction until the latch means is released.

18. Mechanism for coupling an elevator hatchway door to a member on the elevator car, comprising; a base; a substantially right angled bell crank having one arm substantially vertical and a second arm substantially horizontal, pivotally mounted on said base; a second substantially right angled bell crank having one arm substantially vertical and a second arm substantially horizontal, pivotally mounted on said base at a point removed from but substantially horizontal with the pivot point of said first bell crank with the horizontal arm of said second bell crank extendingin the same general direction as the herizontal arm of said first bell crank, and overlapping the same; a pin-and-slot' connection between the horizontal arms of said two bell cranks, the pin being secured to the horizontal arm of one bell crank and the slot being formed in the horizontal arm of the other bell crank, the slot having a width substantially equal to the diameter of said pin, and extending substantially horizontally; an abutment on each of the vertical arms of said bell cranks adapted to be engaged by the member on the elevator car; and a latch for maintaining said bell cranks in a fixed relation to each other.

19. In an elevator installation; at hatchway door at a floor served by the elevator car; mechanism for locking said hatchway door in closed position; a cam; means'mounting said cam on the elevator car for movement with respect thereto; means on the elevator car for moving said cam into engagement with said lock mechanism to actuate said lock mechanism to unlock said hatchway door; and means for unlocking said hatchway door from the landing side thereof only in the event that the elevator car is at said floor, said means comprising, means mounted at said floonfor engaging said cam and causing movement thereof to effect unlocking of said hatchway door, and means for actuating said last preceding means from the landing side of said-hatchway door.

20. In an elevator installation; a hatchway door at a floor served by the elevator car; mechanism for locking said hatchway door in closed position; a cam; means mounting said cam on the elevator car for movement with respect thereto; means on the elevator car for moving said cam into engagement with said lock mechanism to actuate said lock mechanism to unlock said hatchway door; means for unlocking said hatchway door from the landing side thereof only in the event that the elevator car is at said floor, said means comprising, means mounted at said floor for engaging said cam and causing movement thereof to effect unlocking of said hatchway door, andmeans, including a removable key, for actuating said last preceding means from the landing side of said hatchway door; and means for unlocking said hatchway door from the landing side thereof upon occasions regardless of the position of the elevator car, said means comprising, means mounted at said floor -for actuating said locking mechanism directly,

without the intermediary of said cam, to unlock said hatchway door, and means, including a removable key, for actuating said last preceding means from the landing side of said hatchway door, said last mentioned key means being a1?- ranged to be unresponsive to the key of the first mentioned key means.

21. In an elevator installation; a hatchway door at a floor served by the elevator car; a

cam mounted on the elevator car for movement parallel to said hatchway door; means on the elevator car for moving said cam in door opening and door closing directions; a member for engagement by said cam during door opening hatchway door in closed position and movably mounting said member on said hatchway door, actuated,.incident to the engagement of said 'camwith said member, and to the resulting motion thereof with respect to said hatchway door, as said cam is moved in the door opening direction when said hatchway door is closed and the elevator car is opposite said floor, to unlock said hatchway door, and then transmit the door opening movement of said cam to said hatchway door to effect the opening thereof; means mounted at said floor for engaging said cam and moving it in its door opening direction in the event the elevator car is opposite said floor when said means is actuated; and means for actuating said last preceding means from the landing side of said hatchway door, whereby said hatchway door may be unlocked and moved from closed position from the landing side of said hatchway door, but only when the elevator car is opposite said floor.

22. In an elevator installation; a hatchway door at a floor served by the elevator car; a

cam mounted on the elevator car for movementparallel to said hatchway door; means on the elevator car for moving said cam in door opening and door closing directions; a member for engagement by said cam during door opening movement thereof; mechanism locking said hatchway door in closed position, and movably mounting said member on said hatchway door, actuated, incident to the engagement of said cam with said member, and to the resulting motion thereof with respect to said hatchway door, as said cam is moved in the door opening direction when said hatchway door is closed and the elevator car is opposite said floor, to unlock said hatchway door, and then transmit the door opening movement of said cam to said hatchwa f door to effect the opening thereof; means mounted at said -floor for engaging said cam and moving it in its doorv opening direction in the event the elevator car is opposite said floor when said means is actuated; means, including a removable key, for actuating said last preceding means from the landing side of said hatchway door, whereby said hatchway door may be unlocked and moved from closed position from the landing side of said hatchway door, but only when the elevator car is opposite said floor; means mounted at said floor for actuating said locking mechanism directly, without the intermediary of said cam, to unlock said hatchway door; and means,- including a removable key, for actuating said-last preceding means from the landing side of said hatchway door, whereby said hatchway door may be unlocked and moved from closed position from the landing side, of said hatchway door regardless of the position of the elevator car, the last mentioned key means being arranged to be unresponsive to the key of the first mentioned key means so that only those with the key for thel-ast mentioned key means may open said hatchway door from the landing side thereof when the elevator car is not opposite said floor.

CLIFFORD NORTON. BENJAMIN WHITEHEAD TUCKER, JR. 

